The main turtle group there is California Turtle and Tortoise Club. They have different charters listed here:
http://www.tortoise.org/cttc/member.html and according to their group page, they meet this Friday.
CTTC Inland Empire Chapter - Meets: First Friday of the month, 7:30 pm at "The Ark" Church of the Nazarenes in the Fellowship Hall in Young Hall located at 1307 East Citrus Ave, Redlands, CA 92374.
I do not know if this is up to date, if they are knowledgable, if you want to wait, or if you're interested in this group at all (many turtle/tortoise keepers are not RES-friendly) but keep looking around in case. Maybe even shoot a message to Turtle Rescue Long Island for their opinion (they're not in your location but deal with a lot of different issues):
https://www.facebook.com/TurtleRescueLongIsland